reference key for a many to many relationship

[jellyroll12]

How do I create a reference key for a many to many relationship? I have two tables I'm trying to reconcile with shared fields. I'm trying to import 10,000+ records, so want to avoid portals so I don't have to do manual matching. Any ideas?

Picture_6.pdf

[Kent Searight]

The relationship in the diagram looks fine for many-to-many.

Can you be more specific about what you're trying to do? What do you mean by "create a reference key for a many-to-many relationship"? What are shared fields? What do portals have anything to do with importing records?